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succession

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  • First Step of Succession
  • Second Step of Succession
  • Third Step of Succession
  • In the first step of Primary Succession there is only bare rock. There are no organisms present.#160;
  • Fourth Step of Succession
  • In the second step of Primary Succession pioneer species begin to grow. Lichens are usually the pioneer species. Lichens are fungi and algae growing together. They form a symbiotic relationship called mutualism. Following lichens, moss begins to grow. The pioneer species break down the rock into soil. 
  • Fifth Step of Succession
  • In the third step of Primary Succession small grasses begin to grow.  Insects and small rodents also begin to populate the area. 
  • Fifth Step of Succession
  • In the fourth step of Primary Succession small shrubs and bushes begin to grow. Also, small animals like squirrels begin to appear. 
  • In the fifth step of Primary Succession small trees begin to grow.  Larger animals also appear. 
  • In the fifth step of Primary Succession large trees grow, and large animals appear. The ecosystem reaches climax community in the fifth step of Primary Succession. 
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